In the Kara no Kyoukai, each movie is referred to as a Chapter so I've been wondering if they all comes from a single book or separate books and when they say Chapter they are referring to the movie collection (like how some anime series use Chapter # instead of Episode #)
From the Type-Moon Wiki the chapters of the light novel are:
- Chapter 1 – Overlooking the Scenery (俯瞰風景, Fukan Fuukei) Thanatos
- Chapter 2 – Murder Speculation (Part 1) (殺人考察(前), Satsujin Kousatsu (Zen)) …and nothing heart.
- Chapter 3 – Remaining Sense of Pain (痛覚残留, Tsuukaku Zanryuu) ever cry, never life.
- Chapter 4 – The Hollow Shrine (伽藍の洞, Garan no Dou) garan-no-dou.
- Intermission - Kirie/Fujino (境界式, Kyoukai Shiki)
- Chapter 5 – Paradox Spiral (矛盾螺旋, Mujun Rasen) Paradox Paradigm.
- Chapter 6 – Oblivion Recorder (忘却録音, Boukyaku Rokuon) Fairy Tale.
- Intermission - Lio (境界式, Kyoukai Shiki)
- Chapter 7 – Murder Speculation (Part 2) (殺人考察(後), Satsujin Kousatsu (Go)) …not nothing heart.
- Boundary of Emptiness (空の境界, Kara no Kyoukai)
- Future Gospel (未来福音, Mirai Fukuin) recalled out summer
- Final Record (終末録音, Shuumatsu Rokuon) the Garden of Oblivion
And the animated films:
- 2007-12-01 (Japan, Part 1 - Fukan Fuukei) (same as Chapter 1 of novel)
- 2007-12-29 (Japan, Part 2 - Satsujin Kousatsu) (same as Chapter 2 of novel)
- 2008-01-26 (Japan, Part 3 - Tsuukaku Zanryuu) (same as Chapter 3 of novel)
- 2008-05-24 (Japan, Part 4 - Garan no Dou) (same as Chapter 4 of novel)
- 2008-08-16 (Japan, Part 5 - Mujun Rasen) (same as Chapter 5 of novel)
- 2008-12-20 (Japan, Part 6 - Boukyaku Rokuon) (same as Chapter 6 of novel)
- 2009-08-08 (Japan, Part 7 - Satsujin Kousatsu [conclusion]) (same as Chapter 7 of novel)
So the movies' chapters refer to the same chapters from the light novel.